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TSB 18-06-98

Hard starting diagnosis.

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 Date: Feb 27, 1998

Models: 94-98 12 valve Cummins up to 01/01/98

NOTE:   THIS INFORMATION APPLIES TO ALL 5.9L CUMMINS MECHANICALLY INJECTED 12 VALVE DIESELS USED IN THE RAM.

Symptoms: hard or no-start

Diagnosis:

Using  table of values to refer to for timing and other information, determine the cause of the problem. Hard start or no start complaints can be caused by several problems - the following points have a short discussion of the main problem:

1.   low fuel pressure or air entering the system:

2. Loss of fuel system prime. 3.  Incorrect starting procedures: 4.  Injection pump timing: 5.  Intake manifold heater operation: 6.  Fuel heater operation:  
Injection Pump Timing Specifications
Model Year/Trans Intercooled CPL Nominal Timing
89-91 all trans no 804 1.40mm +/- .05mm
91-93 all trans yes 1579,  1351 1.25mm +/- .05mm
94-95 man yes 1816,  1550 5.80mm +/- .1mm
*94-95 auto yes 1959,  1815,  1549 5.80mm +/- .1mm
95 auto yes 1968 4.40mm +/- .1mm
96-98 man yes 2023,  2175 5.10mm +/- .1mm
96-98 auto yes 2022,  2174 4.50mm +/- .1mm
96-98 EGR equipped all trans yes 1863,  2308 4.50mm +/- .1mm

*The injection pump for 94 and early 95 model year trucks p/n R4761366 was superseded to R4798548. If the vehicle has the new p/n R4798548, the engine data tag should have been stamped as CPL 1968 and timing spec for CPL 1968 should be used for the superseded pump.

Policy: Information only.


Thanks to Bob Bergevin for providing this TSB information

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This page was edited on: May 3, 2004